Background images:
    WikiImages <https://pixabay.com/en/horsehead-nebula-dark-nebula-11081>
    Licensed under CC0
Icons and other images:
    Luke Bonham <dada [at] archlinux [dot] info>
    Licensed under CC-BY-NC-SA-3.0
    Source: https://github.com/copycat-killer/awesome-copycats
